Whalepower is a 21 year old from Pennsylvania who is leveling his hunter from 1-90 in one sitting. After 74 hours of non-stop play he’s just reached level 89. You can watch his stream and follow his progress live on Twitch. Don’t try this at home.
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Update: Whalepower dinged 90 in the Shado-Pan Monastery after 3 days, 11 hours, and 30 minutes of continuous play.